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Organization and Significant Accounting Policies - Intangible Assets (Details) - Patents - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible asset, useful life 10 years  
Finite-lived intangible assets, accumulated amortization $ 592 $ 320
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2020 353  
2021 353  
2022 209  
2023 124  
2024 110  
Thereafter $ 222